EFFECTIVENESS OF MODEL CONSTRUCTED WETLANDS CONTAINING Chrysopogon zizanioides, Pistia stratiotes and Hydrilla verticillata PLANT SPECIES IN REDUCING LEAD (PB) CONCENTRATION

• Main Author: DETRI KIRANA (NIM : 10613054), VINA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/31486
• Institution: Institut Teknologi Bandung

<p align="justify"> Liquid waste containing lead (Pb) is commonly found in the environment as a result of human activity. Pb is considered toxic to the environment and living organisms, including humans, because of its carcinogenic characteristic. Constructed wetlands with hyper-accumulator plants have the potential to reduce Pb in the environment. The objectives of this research was to determine the effectiveness of model constructed wetland systems containing the plants Chrysopogon zizanioides, Pistia stratiotes and Hydrilla verticillata, and to determine the amount of Pb translocated in the shoot and root of these three plant species. Simulated waste water with 11.8 mg/L Pb was poured into five constructed wetland systems made of 20x20x50 cm glass aquariums, i.e., systems consisting of: (1) substrate with C. zizanioides; (2) substrate with P. stratiotes; (3) substrate with H. verticulata; (4) substrate without plants as a control; and (5) neither plants nor substrate as a control. The Pb content of waste water was measured at 8; 16; 24; 32; 40; 48; 56; 64; 72 hours. After 72 hours, results showed reduction in Pb content in the amount of 99.3%; 99.6%; 99.4%; 99.7% for systems 1, 2, 3, and substrate control respectively.Statistical analysis showed no significant difference among these four systems (p>0.05), but all were statistically different from the control system without substrate or plants (p<0.05) which only decreased Pb content by 14.4%. The shoots and roots of C. zizanioides and P. stratiotes showed average Pb concentrations of 101; 101 mg/kg and 6,600; 6,550 mg/kg respectively; while the body of H. verticillata showed average Pb content of 19,350 mg/kg. Based on overall results, it can be concluded that the three systems with plants and substrate were effective in decreasing the amount of Pb in simulated waste water.<p align="justify"> <br />